PHOTOCONDUCTIVITY SK007
Exp-1 To study the current vs voltage characteristics of CdS photo-resistor at constant irradiance.
Exp-2 To measure the photo-current as a function of the irradiance at constant voltage.
- Multipurpose power supply.
- Electrical safety tested.
- Adjustable slit self centering.
- Marked analyzer & polarizer for angle measurement.
- Photo resistor.
- Photo current.
- Irradiance.
Principle and Working:
Absorption of light increases electrical conductivity in a solid. In case of cadmium sulphide (CdS) photoresistor, when it is exposed to light the transition of activator electrons into the conduction band and charge exchange of traps with holes being created in the valence band causing enhancement of conductivity.
In the present setup, photo current is studied as a function of the voltage applied to the photo resistor at a constant irradiance. The angle of polarization is changed by polarizer filter.
Contents:
| Cat. No. | Item Name | Qty. |
| SL804 | Photoresistor in holder (CdS) | 1 |
| SE080 | Power supply 12V AC/DC 5 Amp. | 1 |
| SL803 | Lamp housing | 1 |
| SL754 | Convex lens in holder | 1 |
| SL801 | Polarizer/Analyzer (pair) | 1 |
| SL214 | Optical bench | 1 |
| SL802 | Adjustable slit self centering | 1 |
| SE079 | Reg. power supply, 0-16V DC, 5A | 1 |
| SE067 | Digital multimeter | 1 |
| SN203 | Flexible plug lead, 50 cm (Red) | 2 |
| SN201 | Flexible plug lead, 1m (Black) | 1 |
| SL216 | Shaddle | 1 |
| SL436 | Transversal saddle | 1 |
- Power Supply 0-16V, 5A SE079
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SPECIFICATIONS Voltage : 0-16 Volt DC continuously variable & stabilized
Ripple : Less than 25mV
Overload protection : Current limiting
Current : 5 Amp. continuously variable from 10% to full rating
Display : Two separate displays(3 digit LED) are provided to monitor the output voltage and load current continuously
Working voltage : 230V AC, 50 Hz single phase
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- Power Supply 12V AC/DC SE080
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SPECIFICATIONS Output : 2,3,4,5,6,8,10 & 12VAC full wave rectified, unsmoothed & unregulated D.C.
Overload : Resettable thermal trip.
Input : 230 V AC,50 Hz
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- Optical Bench SL214
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SPECIFICATIONS Material : Aluminium alloy
Type : Hexagonal section
Scale : 0-100cm
Least count : 1mm
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- Polarizer / Analyzer SL801
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SPECIFICATIONS Angle : Adjustable (0°-90°)
Aperture : 21mm dia.
Frame : 130mm dia., to avoids scattering of lights
Rod : 10 mm dia.
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- Lamp Housing SL803
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SPECIFICATIONS Lamp : 12V, 21V
Lens : Spherical condenser, to and for adjustment
Connection : 4mm plug lead
Mounting rod : 10mm dia.
Housing : Aluminium, Heat ventilation arrangement
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- Convex Lens in Holder SL754
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SPECIFICATIONS Focal Length : 100mm
Diameter of Lens : 50 mm
Frame Diameter : 130 mm to avoids scattering of lights
Rod Diameter : 10 mm
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- Digital Multimeter SE067
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SPECIFICATIONS Resistance : 200W, 2000W, 20k, 200k & 2000k W.
D.C.Voltage : 200 & 2000 mV
: 20, 200 & 600 V
A.C.Voltage : 200 & 600 V
D.C.Current : 200 & 2000 mA
: 20 & 200 mA
: 10 A
Testing : Diode & transistor
Battery : 9V
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- Photo Resistor LDR in Mount SL804
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SPECIFICATIONS Photo resistor : CdS ( Cadmium sulphide)
Aperture : 10mm, Clear
Mounting rod : 10mm dia.
Connection : 4mm safety terminals
Working voltage : 0-16V DC
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- Adjustable Slit Self Centring SL802
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SPECIFICATIONS Slit Width : 0-2 mm
Height : 6 mm
Frame Diameter : 120 mm to avoids scattering of lights
Mounting rod : 10mm dia.
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Solid State Physics Experiments
- Four Probe - Resistivity Measurement
- Photoconductivity
- Hall Effect
- Study of P-N Junction & Energy Band Gap
- Pin Diode Characteristics
- Superconductivity Experiment Kit
- Dia-, Para- and Ferromagnetism
- Study of BH-Curve with Deep
- Quinck's Tube Method
- Elastic & Plastic Deformation
- Planck's Constant by LED